ubi-tests: io_read: Filter invalid offset value before 'lseek' in io_read test

There are many different offset values passed in 'lseek' during io_read
testing of ubi test. The offset value maybe a negative number or a big
number that exceeds the volume data size, which can lead to ubi tests
failure by passing invalid offset value to 'lseek'. For example:

Example 1: The data size of volume is 39525 bytes, offset = (sz) -
MAX_NAND_PAGE_SIZE - 1, where MAX_NAND_PAGE_SIZE is 65536. Here, offset
is a negative value passed to 'lseek', which leads to fail in io_read.

  ======================================================================
  ======================================================================
  ======================================================================
  Test on mtdram, fastmap enabled, VID header offset factor 1
  ======================================================================
  ======================================================================
  ======================================================================
  mtdram: 16MiB, PEB size 16KiB, fastmap enabled
  Running mkvol_basic /dev/ubi0
  Running mkvol_bad /dev/ubi0
  Running mkvol_paral /dev/ubi0
  Running rsvol /dev/ubi0
  Running io_basic /dev/ubi0
  Running io_read /dev/ubi0
  [io_basic] test_read3():189: function seek() failed with error 22
  (Invalid argument)
  [io_basic] test_read3():190: len = 1
  [io_basic] test_read2():237: offset = -26012
  [io_basic] test_read1():303: length = 1
  [io_basic] test_read():362: alignment = 7905
  Error: io_read failed
  FAILURE

Example 2: The data size of volume is 79035 bytes, offset = 2 *
MAX_NAND_PAGE_SIZE, where MAX_NAND_PAGE_SIZE is 65536. Here, offset is a
value exceeds volume size, which leads to fail in io_read.

  ======================================================================
  ======================================================================
  ======================================================================
  Test on mtdram, fastmap enabled, VID header offset factor 1
  ======================================================================
  ======================================================================
  ======================================================================
  mtdram: 16MiB, PEB size 16KiB, fastmap enabled
  Running mkvol_basic /dev/ubi0
  Running mkvol_bad /dev/ubi0
  Running mkvol_paral /dev/ubi0
  Running rsvol /dev/ubi0
  Running io_basic /dev/ubi0
  Running io_read /dev/ubi0
  [io_basic] test_read3():185: function seek() failed with error 22
  (Invalid argument)
  [io_basic] test_read3():186: len = 1
  [io_basic] test_read2():233: offset = 131072
  [io_basic] test_read1():299: length = 1
  [io_basic] test_read():358: alignment = 3
  Error: io_read failed
  FAILURE

This patch checks offset value before executing 'lseek', invalid offset
values are filtered.

----------------------------------------

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

0 files changed, 0 insertions, 0 deletions